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Year 10 CHEMISTRY REVISION WORKSHEET -2016-2017

1. The structures of sodium chloride and nitrogen are shown below.

(a) Describe the structure and bonding of these two substances and the differences in

• their melting/boiling points.

• their electrical conductivity.

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2. Complete the electronic structure of a molecule of ammonia. Show only the outer electrons.

[2] (a) Ammonia reacts with copper(II) oxide.

2NH3 + 3CuO → 3Cu + 3H2O + N2

Calculate the mass of copper formed if 50 Kg of ammonia reacts with excess of copper oxide.

Show working of your answer.

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3. The diagram shows the positions of some elements in four periods of the Periodic Table.Use

the diagram to answer the following questions.

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(a) (i) What numbers are used to identify the periods shown in this diagram?

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(ii) Explain which element in the diagram is the least reactive. [2]

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(iii) State the similarity in the electronic configurations of Na and Ar. [1]

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(iv) State the similarity in the electronic configurations of Na and Rb. [1]

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(v) State a physical property of Na that shows it is a metal. [1]

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4.(a) The diagram shows the addition of two of these elements to troughs containing water.

(i) State two observations that could be made in both troughs when the elements are added to

water.

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(ii) State one observation that could be made only in trough B.

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(iii) Complete the chemical equation for the reaction that occurs in trough A.

2Li + 2H2O → ......................................................... + .....................................................[2]

(iv) After the reaction in trough A is complete, a few drops of phenolphthalein are added.

The phenolphthalein changes colour.

State the final colour of the phenolphthalein.

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(v) Give the formula of the ion formed during the reaction in trough A that causes

phenolphthalein to change colour.

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(b) Silver (Ag) can be obtained from silver oxide by heating. In an experiment, 32.4 g of silver is

obtained by completely decomposing 34.8 g of silver oxide.

(i) Calculate the mass of oxygen formed in this decomposition.

mass of oxygen = ................................................................ g [1]

(ii) Determine the empirical formula of silver oxide by calculating the amounts, in moles, of

silver atoms (Ag) and oxygen atoms (O) obtained in this experiment.

empirical formula of silver oxide = ................................................................ [3]

(c) X and Y are isotopes of the silver. Which statement is correct? [1]

A X and Y have atoms with different numbers of electron shells.

B X and Y have atoms with the same nucleon number.

C X and Y have atoms with the same number of outer shell electrons.

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D X and Y have different chemical properties.

4. The label on a bottle of orange drink stated ‘contains no artificial colours’. A scientist thought

that the orange colour in the drink was a mixture of two artificial colours:

• Sunset Yellow E110

• Allura Red E129

(a)Plan an investigation to show that the orange colour in the drink did not contain these two

artificial colours. You are provided with samples of E110, E129 and the orange colouring from

the drink. You are also provided with common laboratory apparatus.

You may draw a diagram in the given space to help answer the question. [6]

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(b) When dilute nitric acid is added to an aqueous solution, followed by silver nitrate

solution, a white precipitate forms. [1]

Which of these halide ions is present in the aqueous solution?

A Br–

B Cl–

C F–

D I–

(c) Lead(II) chloride is an insoluble salt that can be prepared by reacting lead(II) nitrate

with sodium chloride.

Describe how you would prepare a pure, dry sample of lead(II) chloride starting

from solid lead(II) nitrate and solid sodium chloride. [4]

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5.Tin (II) chloride can be made using tin(II) oxide and hydrochloric acid.Describe the

preparation of tin (II) chloride and explain each step of the process including word and symbol

equations. (6 marks)

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6. (a) The table shows some properties of cobalt, copper, magnesium and tin.

Answer the questions using the information shown in the table.

(i) Which metal is the best to use for the base of a pan for cooking food?

Use information in the table to give reasons for your answer.

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(ii) Which metal in the table is most likely to be used in an alloy for aircraft bodies?

Use information in the table to give reasons for your answer.

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(b) Some observations about the reactions of the four metals with hydrochloric acid are shown

in the table.

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Use the information in the table to put these metals in order of their reactivity with hydrochloric

acid. [2]

(c) Tungsten is a useful metal. It has the chemical symbol W.

One method of extracting tungsten involves heating a tungsten compound (WO3) with hydrogen.

(i) Balance the equation for the reaction between WO3 and hydrogen. [1]

WO3 + ............................H2 ............................W + ............................H2O

(iii) Why is this reaction described as reduction? [1]

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7.A student compared the rates of reaction of three metal carbonates.

She measured the volume of gas released using the apparatus shown.

The graph shows the volume of carbon dioxide released when the three metal carbonates

were heated.

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(i) Which carbonate produced carbon dioxide at the highest rate?

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(ii) What volume of carbon dioxide was produced by strontium carbonate in twelve minutes?

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(f) Describe limewater can be used to show that the gas produced is carbon dioxide.

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8. Concentrated hydrochloric acid can be electrolysed using the apparatus shown.

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(a) Define the term electrolysis?

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(b) State the name of the gas given off at the negative electrode. Explain a laboratory method of

identification of this gas

Name of the gas…………………………………………………………………………………[1]

Identification

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[2] (c) When concentrated hydrochloric acid is electrolysed, chlorine is released.

Describe a test for chlorine.

test

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result

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(d) Hydrochloric acid reacts with the base calcium hydroxide.

(i) Complete the word equation for this reaction.

hydrochloric acid + calcium hydroxide → …………………… + …………………… [1]

(ii) Hydrochloric acid also reacts with zinc.

Complete the symbol equation for this reaction.

Zn + ........HCl → ZnCl2 + ........ [2]

9. Calcium reacts with chlorine to form the ionic compound calcium chloride (CaCl2 ).

(i) Describe, in terms of electrons, how an atom of calcium reacts with two chlorine atoms to

form calcium chloride.

Include dot and cross diagrams in your answer. (Outer shell only) [4]

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